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That's it, that's the definitive answer-it clicks in the tank? The pump is bad, and will need replacing. It should turn on for about 2 seconds to pressurize the fuel line and system with key on-that is the hum you refer to.

You need to determine if the problem is in the ignition switch or the fuel shut off solenoid in the Injector pump. As you stand in front of the truck facing the engine, the wire that goes to the FRONT connector on the DRIVERS side top of the injector pump will be the shut off solenoid.

turn the key to "run" and then disconeect that wire, if it "clicks' then the problem is most likely the ignition switch. If it doesn't then run a jumper wire from the positive post of a bettery to the connection. If it clicks then the problem is the ignition switch, If it doesn't, then the solenoid has failed. the fuel shut off solenoid is available and not hard to change. Just be sure to pay attention to to the spring and how it is assembled. You can purchase the fuel shut off solenoid from mid west fuel injection, there may be other places but I know they have it. Ignition switch should be available form most any auot parts store.

sounds like a bad connection,or a bad starter,if you can get under it and smack starter with a hammer,it may be stuck....check connections first... iif it doesnt take off then you need a starter....if it was running fine when you shut it off.. not been sitting for long while,knocking when you shut it off,or over heated..

The F32668 uses the CTC203 series chassis and I usually see 2 problems when the set will not run. The first is poor solder joints on a small coil near the horizontal output transistor, but if thats the case the set tends to run for a while and randomly shut off. When the set clicks and never runs I usually find that the flyback (high voltage) transformer has shorted out inside. In this case the flyback should be replaced by an experienced tech.